| 摘要 |
Dyestuffs of the formula <IMAGE> wherein R1 and R2 represent optionally substituted alkyl groups which can be interrupted by heteroatoms, and R1 and R2 together with the nitrogen atom at the aromatic nucleus are able to form a 5- or 6-membered ring, X represents a NH group or an oxygen atom and R represents an organic radical. the dyestuffs dye polyester fibers in brilliant yellow shades.
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